CN2553133Y

CN2553133Y - Inclined disc axial plunger pump

Info

Publication number: CN2553133Y
Application number: CN 02236414
Authority: CN
Inventors: 彭学; 李德兴; 覃祖智; 梁健; 黄建勋; 苏强
Original assignee: LIUZHOU BUILDING MACHINERY GENERAL FACTORY
Current assignee: LIUZHOU BUILDING MACHINERY GENERAL FACTORY
Priority date: 2002-05-21
Filing date: 2002-05-21
Publication date: 2003-05-28
Anticipated expiration: 2012-05-21

Abstract

The utility model relates to a wobble plate axial piston pump, comprising a stationary wobble plate 1, an oil distribution plate 9, a rotatable sliding shoe 3, a return plate 4, a plunger piston 5, a spring 6, a cylinder body 7 and a rotating shaft 8, wherein, the rotating shaft 8 is arranged on the round hole at the middle of the cylinder body 7 and connected with the cylinder body through a spline, the head end of the plunger piston 5 is made as spherical hinge with the sliding shoe, the sliding shoe is sleeve-jointed in the holes on the periphery of the return plate, a flat thrust bearing 2 is arranged on the wobble plate 1, a bearing bottom plate is fixed on the wobble plate 1, the upper piece of the bearing 2 is contacted with the surface of the sliding shoe 3 and rotated together with the sliding shoe 3 and the return plate 4, the plunger piston 5 and the sliding shoe 3 are solid. The utility model has the advantages that the axial piston pump use the rolling friction of the flat thrust bearing to substitute the sliding friction between the sliding shoe and the wobble plate, which can reduce the abrasion of sliding shoe, no oil-film lubrication is needed between the sliding shoe and the wobble plate and no oil hole is needed on the plunger piston and the sliding shoe; thus, the structure of the axial piston pump can be simplified, the production cost can be decreased, the internal leakage of oil pump can be eliminated and the volume efficiency of the oil pump can be enhanced.

Description

Cam-type axial piston pump

One, technical field:

The utility model relates to a kind of oil pump, particularly a kind of cam-type axial piston pump.

Two, background technique:

Existing cam-type axial piston pump, swash plate a and thrust plate h are fixed, cylinder body f rotates along with the rotation of rotatingshaft g with plunger d, piston shoes b, backhaul dish c and spring e, for the piston shoes b that reduces to rotate and the friction between the stationary swash plate a, must on plunger d and the piston shoes that link to each other with plunger by ball pivot b, have oil through (referring to Fig. 2), form oil film when piston shoes b is rotated on swash plate a, like this, strengthened the difficulty of processing of plunger and piston shoes on the one hand; Simultaneously, form certain leakage between piston shoes b and the swash plate a, reduced the volumetric efficiency of oil pump.

Three, summary of the invention:

Technical problem to be solved in the utility model is: the plunger of existing cam-type axial piston pump and piston shoes difficulty of processing form certain leakage more greatly, simultaneously between piston shoes b and the swash plate a, reduced the problem of the volumetric efficiency of oil pump.Provide the processing of a kind of plunger and piston shoes simpler, the cam-type axial piston pump that good manufacturability and internal leakage are less.

Its concrete scheme of dealing with problems is: a plain thrust bearing is set between the piston shoes of stationary swash plate and rotation, is connected by bearing between fixed block and the rotating component, plunger and piston shoes are made solid.

Its concrete structure is: a kind of cam-type axial piston pump, comprise stationary swash plate, oil distribution casing, and rotating piston shoes, the backhaul dish, plunger, spring, cylinder body, rotatingshaft, rotatingshaft is positioned at cylinder body middle part circular hole and is connected with spline with cylinder body, plunger head is made spherical hinge type, be with piston shoes on it, these piston shoes are socketed in the backhaul dish hole all around, it is characterized in that: plain thrust bearing is housed on swash plate, the bearing egative film is fixed on the swash plate, bearing last slice contacts with the piston shoes face, and can together rotate along with piston shoes and backhaul dish, described plunger and piston shoes are solid.

Because the cam-type axial piston pump of the utility model adopts said structure, with the rolling friction replacement piston shoes of plain thrust bearing and the sliding friction between swash plate, the one, the wearing and tearing that alleviated piston shoes, the 2nd, no longer need film lubrication between piston shoes and swash plate; Thereby plunger and piston shoes need not process oil through, both simplify the structure, reduced cost of production; Reduce the internal leakage of oil pump again, improved the volumetric efficiency of oil pump.

Four, description of drawings:

Fig. 1: the cam-type axial piston pump structural representation of the utility model;

Fig. 2: existing cam-type axial piston pump structural representation.

Five: embodiment:

Embodiment:

A kind of cam-type axial piston pump, comprise swash plate 1, piston shoes 3, backhaul dish 4, plunger 5, spring 6, cylinder body 7, rotatingshaft 8, oil distribution casing 9, rotatingshaft 8 is positioned at cylinder body 7 middle part circular holes and is connected with spline with cylinder body, plunger 5 heads are made spherical hinge type, are with piston shoes 3 on it, these piston shoes 3 are socketed in backhaul dish 4 hole all around, plain thrust bearing 2 is housed on swash plate 1, the bearing egative film is fixed on the swash plate 1, bearing 2 last slice contacts with 3 of piston shoes, and can be along with piston shoes 3 and backhaul dish 4 together rotate, described plunger 5 and piston shoes 3 are solid.

When rotatingshaft 8 drive cylinder bodies 7, plunger 5, piston shoes 3, backhaul dish 4 etc. rotate, piston shoes 3 and plain thrust bearing 2 last slice together rotate, plain thrust bearing 2 rolls relatively, backhaul dish 4 is with plunger 5 to-and-fro motion in the plunger cavity of cylinder body 7, fluid sucks by oil distribution casing 9 or extrudes plunger cavity, obtains pressure stable oil.

Claims

1, a kind of cam-type axial piston pump, comprise stationary swash plate (1), oil distribution casing (9), and rotating piston shoes (3), backhaul dish (4), plunger (5), spring (6), cylinder body (7), rotatingshaft (8), rotatingshaft (8) is positioned at cylinder body (7) middle part circular hole and is connected with spline with cylinder body, plunger (5) head is made spherical hinge type, be with piston shoes (3) on it, these piston shoes (3) are socketed in backhaul dish (4) hole all around, it is characterized in that: plain thrust bearing (2) is housed on swash plate (1), the bearing egative film is fixed on the swash plate (1), bearing (2) last slice contacts with piston shoes (3) face, and can together rotate along with piston shoes (3) and backhaul dish (4), described plunger (5) and piston shoes (3) they are solid.